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Changes in the electric field makes changes in magnetic field and vice versa. What does this logically mean? It looks like an infinite loop. I don't understand how this helps...
Asked on 12/04/2021
2 answerLet's suppose we have a point charge with no dimensions (zero volume and surface area) absorbing photons from Sun. Does it change the amount of photons and energy absorbed when...
Asked on 12/04/2021
4 answerIn electromagnetism, we have the continuity equation $$frac{partial}{partial t} rho(vec{r},t) = - vec{nabla} cdot vec{j}$$ which, upon integration over a finite volume $V$ bound by surface $S$...
Asked on 12/04/2021
3 answerIn Griffith's introduction to electromagnetism on page 479, there is this following equation: begin{align*}nabla V &cong nabla left[frac{1}{4pi epsilon_0} frac{boldsymbol{hat r} cdot dot{mathbf{p}}(t_0)}{rc} right] \&cong left[frac{1}{4pi...
Asked on 12/04/2021
1 answerWhat would happen if you created a micro-black hole and could continuously feed it as quickly as it evaporates? Is it possible that it would remain relatively stable? If...
Asked on 12/03/2021
2 answerImagine that a mast of a sailboat is $186,000$ miles long, and the sailboat is moving to the right at a constant $10$ miles per second. If you...
Asked on 12/03/2021
4 answerThe angular velocity vector of a rigid body is defined as $vec{omega}=frac{vec{r}timesvec{v}}{|vec{r}|^2}$. But I'd like to show that that's equivalent to how most people intuitively think...
Asked on 12/03/2021
8 answerI read there are two definitions about $S$-operator: The first one (e.g (8.49) in Greiner's Field Quantization) is:$$S_{fi}equiv langle Psi_p^{-}| Psi_k^{+}rangle$$where $|Psi_p^{-}rangle$...
Asked on 12/03/2021
2 answerWhen a vehicle takes a turn is the sharpness viz radius of turn related to the velocity by conservation of angular momentum? If it is so then while going on...
Asked on 12/03/2021
4 answerUnder the coordinate transformation $bar x=x+varepsilon$, the variation of the metric $g^{munu}$ is:$$delta g^{munu}(x)=bar g^{munu}(x)-g^{munu}(x)=-frac{partial{ g^{munu}}}{partial x^{alpha}}varepsilon^{alpha}+ g^{mubeta}frac{partial varepsilon^{nu}}{partial x^{beta}}+g^{alphanu}frac{partial varepsilon^{mu}}{partial x^{alpha}}$$the right...
Asked on 12/03/2021
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